CVE-2026-21533 — Microsoft Windows Improper Privilege Management Vulnerability
CVE-2026-21533: Microsoft Windows Improper Privilege Management Vulnerability
CISA Known Exploited Vulnerability (KEV)
| Vendor / project | Microsoft |
| Product | Windows |
| Date added | 2026-02-10 |
| Due date | 2026-03-03 |
| Ransomware campaign use | Unknown |
Description
Microsoft Windows Remote Desktop Services contains an improper privilege management vulnerability that could allow an authorized attacker to elevate privileges locally.
Required action (CISA)
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21533 ; https://nvd.nist.gov/vuln/detail/CVE-2026-21533
References
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-21533
- KEV catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog